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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5653) DistCp does not honour config-overrides for mapreduce.[map,reduce].memory.mb
Date Tue, 26 Nov 2013 17:06:38 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13832763#comment-13832763
] 

Jason Lowe commented on MAPREDUCE-5653:
---------------------------------------

Thinking about this further, I see why addDefaultResource() will not work.  distcp-default.xml
and mapred-site.xml will often overlap, and it's likely mapred-site.xml will be loaded first
then distcp-default.xml will later stomp any overlapping values when it's loaded.

So I'd like to see a comment for the property iteration loop explaining why we can't use addDefaultResource.
 Also a unit test would be nice to verify it's working as-intended.

> DistCp does not honour config-overrides for mapreduce.[map,reduce].memory.mb
> ----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5653
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5653
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: distcp
>    Affects Versions: trunk, 0.23.9, 2.2.0
>            Reporter: Mithun Radhakrishnan
>            Assignee: Mithun Radhakrishnan
>         Attachments: MAPREDUCE-5653.branch-0.23.patch, MAPREDUCE-5653.branch-2.patch,
MAPREDUCE-5653.trunk.patch
>
>
> When a DistCp job is run through Oozie (through a Java action that launches DistCp),
one sees that mapred.child.java.opts as set from the caller is honoured by DistCp. But, DistCp
doesn't seem to honour any overrides for configs mapreduce.[map,reduce].memory.mb.
> Problem has been identified. I'll post a patch shortly.



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